On Sat, 2020-11-14 at 20:23 +0000, Michael H Deckers via tz wrote:
This year, at the instant when UTC was 2020-03-08T10Z, Pacific time jumped from 2010-03-08T02 to 2010-03-08T03, and when UTC was 2017-01-01T00Z, TAI jumped from 2017-01-01T00:00:36 to 2017-01-01T00:00:37, as the IERS tells us. Since the rates of UTC, Pacific time and TAI are the same, the question, what was UTC when Pacific time was 2010-03-08T02:30, is exactly similar to the question what was UTC when TAI was 2017-01-01T00:00:36.5.
Michael Deckers.
Since 2017-01-01T00:00:36.5 TAI is a valid time, and UTC has a name for every second, there must be a corresponding UTC time. If I have done my arithmetic correctly, that time is 2016-12-31T23:59:60.5 UTC. This is not the same as asking for the UTC corresponding to 2010-03- 08T02:30 Pacific time, because that is not a valid time. That is, there is no point in time with that name. John Sauter (John_Sauter@systemeyescomputerstore.com) -- PGP fingerprint E24A D25B E5FE 4914 A603 49EC 7030 3EA1 9A0B 511E